Re: [PATCH v9 00/11] SMMUv3 Nested Stage Setup (VFIO part)

[Tomasz Nowicki]

Hi Eric,

On 11.07.2019 15:56, Eric Auger wrote:
> This series brings the VFIO part of HW nested paging support
> in the SMMUv3.
> 
> The series depends on:
> [PATCH v9 00/14] SMMUv3 Nested Stage Setup (IOMMU part)
> (https://www.spinics.net/lists/kernel/msg3187714.html)
> 
> 3 new IOCTLs are introduced that allow the userspace to
> 1) pass the guest stage 1 configuration
> 2) pass stage 1 MSI bindings
> 3) invalidate stage 1 related caches
> 
> They map onto the related new IOMMU API functions.
> 
> We introduce the capability to register specific interrupt
> indexes (see [1]). A new DMA_FAULT interrupt index allows to register
> an eventfd to be signaled whenever a stage 1 related fault
> is detected at physical level. Also a specific region allows
> to expose the fault records to the user space.
> 
> Best Regards
> 
> Eric
> 
> This series can be found at:
> https://github.com/eauger/linux/tree/v5.3.0-rc0-2stage-v9

I think you have already tested on ThunderX2, but as a formality, for 
the whole series:

Tested-by: Tomasz Nowicki <tnowicki@xxxxxxxxxxx>
qemu: https://github.com/eauger/qemu/tree/v4.1.0-rc0-2stage-rfcv5
kernel: https://github.com/eauger/linux/tree/v5.3.0-rc0-2stage-v9 + 
Shameer's fix patch

In my test I assigned Intel 82574L NIC and perform iperf tests.

Other folks from Marvell claimed this to be important feature so I asked 
them to review and speak up on mailing list.

Thanks,
Tomasz